You may wind up cutting the head off, and then welding a nut on the end. I've seen a couple that were really tight like that, but....I've seen more that stripped the threads in the crank from being too tight...
There's really no need for a crank bolt to be that tight....yeeesh! Bubba been around yer car, has he?
Another off the wall idea is to try a pipe wrench on it. I'm assuming you already have all of the pulleys off. You'll need some way to "lock" the engine down so the crank won't turn...easiest to lock the flywheel, or if it's a standard trans, disconnect the shift linkage, and put the trans in Rev and first at the same time. That will lock the crank down.
One trick I've used many times, tho it's a little dangerous, is to put a socket with a long breaker bar on the bolt, and wedge the breaker bar against the frame. Dis-connect the ignition wiring so it won't start, and then "bump" the key a time or two. This makes the starter break the bolt loose. Of course, if the bolt head is messed up, this ain't gonna work, but if your pipe wrench is long enough, you can certainly give it a try...just be very careful.
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Joel Adams
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"